linux/scripts/mod/sumversion.c
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   1#include <netinet/in.h>
   2#ifdef __sun__
   3#include <inttypes.h>
   4#else
   5#include <stdint.h>
   6#endif
   7#include <ctype.h>
   8#include <errno.h>
   9#include <string.h>
  10#include <limits.h>
  11#include "modpost.h"
  12
  13/*
  14 * Stolen form Cryptographic API.
  15 *
  16 * MD4 Message Digest Algorithm (RFC1320).
  17 *
  18 * Implementation derived from Andrew Tridgell and Steve French's
  19 * CIFS MD4 implementation, and the cryptoapi implementation
  20 * originally based on the public domain implementation written
  21 * by Colin Plumb in 1993.
  22 *
  23 * Copyright (c) Andrew Tridgell 1997-1998.
  24 * Modified by Steve French (sfrench@us.ibm.com) 2002
  25 * Copyright (c) Cryptoapi developers.
  26 * Copyright (c) 2002 David S. Miller (davem@redhat.com)
  27 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  28 *
  29 * This program is free software; you can redistribute it and/or modify
  30 * it under the terms of the GNU General Public License as published by
  31 * the Free Software Foundation; either version 2 of the License, or
  32 * (at your option) any later version.
  33 *
  34 */
  35#define MD4_DIGEST_SIZE         16
  36#define MD4_HMAC_BLOCK_SIZE     64
  37#define MD4_BLOCK_WORDS         16
  38#define MD4_HASH_WORDS          4
  39
  40struct md4_ctx {
  41        uint32_t hash[MD4_HASH_WORDS];
  42        uint32_t block[MD4_BLOCK_WORDS];
  43        uint64_t byte_count;
  44};
  45
  46static inline uint32_t lshift(uint32_t x, unsigned int s)
  47{
  48        x &= 0xFFFFFFFF;
  49        return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
  50}
  51
  52static inline uint32_t F(uint32_t x, uint32_t y, uint32_t z)
  53{
  54        return (x & y) | ((~x) & z);
  55}
  56
  57static inline uint32_t G(uint32_t x, uint32_t y, uint32_t z)
  58{
  59        return (x & y) | (x & z) | (y & z);
  60}
  61
  62static inline uint32_t H(uint32_t x, uint32_t y, uint32_t z)
  63{
  64        return x ^ y ^ z;
  65}
  66
  67#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
  68#define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (uint32_t)0x5A827999,s))
  69#define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (uint32_t)0x6ED9EBA1,s))
  70
  71/* XXX: this stuff can be optimized */
  72static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words)
  73{
  74        while (words--) {
  75                *buf = ntohl(*buf);
  76                buf++;
  77        }
  78}
  79
  80static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words)
  81{
  82        while (words--) {
  83                *buf = htonl(*buf);
  84                buf++;
  85        }
  86}
  87
  88static void md4_transform(uint32_t *hash, uint32_t const *in)
  89{
  90        uint32_t a, b, c, d;
  91
  92        a = hash[0];
  93        b = hash[1];
  94        c = hash[2];
  95        d = hash[3];
  96
  97        ROUND1(a, b, c, d, in[0], 3);
  98        ROUND1(d, a, b, c, in[1], 7);
  99        ROUND1(c, d, a, b, in[2], 11);
 100        ROUND1(b, c, d, a, in[3], 19);
 101        ROUND1(a, b, c, d, in[4], 3);
 102        ROUND1(d, a, b, c, in[5], 7);
 103        ROUND1(c, d, a, b, in[6], 11);
 104        ROUND1(b, c, d, a, in[7], 19);
 105        ROUND1(a, b, c, d, in[8], 3);
 106        ROUND1(d, a, b, c, in[9], 7);
 107        ROUND1(c, d, a, b, in[10], 11);
 108        ROUND1(b, c, d, a, in[11], 19);
 109        ROUND1(a, b, c, d, in[12], 3);
 110        ROUND1(d, a, b, c, in[13], 7);
 111        ROUND1(c, d, a, b, in[14], 11);
 112        ROUND1(b, c, d, a, in[15], 19);
 113
 114        ROUND2(a, b, c, d,in[ 0], 3);
 115        ROUND2(d, a, b, c, in[4], 5);
 116        ROUND2(c, d, a, b, in[8], 9);
 117        ROUND2(b, c, d, a, in[12], 13);
 118        ROUND2(a, b, c, d, in[1], 3);
 119        ROUND2(d, a, b, c, in[5], 5);
 120        ROUND2(c, d, a, b, in[9], 9);
 121        ROUND2(b, c, d, a, in[13], 13);
 122        ROUND2(a, b, c, d, in[2], 3);
 123        ROUND2(d, a, b, c, in[6], 5);
 124        ROUND2(c, d, a, b, in[10], 9);
 125        ROUND2(b, c, d, a, in[14], 13);
 126        ROUND2(a, b, c, d, in[3], 3);
 127        ROUND2(d, a, b, c, in[7], 5);
 128        ROUND2(c, d, a, b, in[11], 9);
 129        ROUND2(b, c, d, a, in[15], 13);
 130
 131        ROUND3(a, b, c, d,in[ 0], 3);
 132        ROUND3(d, a, b, c, in[8], 9);
 133        ROUND3(c, d, a, b, in[4], 11);
 134        ROUND3(b, c, d, a, in[12], 15);
 135        ROUND3(a, b, c, d, in[2], 3);
 136        ROUND3(d, a, b, c, in[10], 9);
 137        ROUND3(c, d, a, b, in[6], 11);
 138        ROUND3(b, c, d, a, in[14], 15);
 139        ROUND3(a, b, c, d, in[1], 3);
 140        ROUND3(d, a, b, c, in[9], 9);
 141        ROUND3(c, d, a, b, in[5], 11);
 142        ROUND3(b, c, d, a, in[13], 15);
 143        ROUND3(a, b, c, d, in[3], 3);
 144        ROUND3(d, a, b, c, in[11], 9);
 145        ROUND3(c, d, a, b, in[7], 11);
 146        ROUND3(b, c, d, a, in[15], 15);
 147
 148        hash[0] += a;
 149        hash[1] += b;
 150        hash[2] += c;
 151        hash[3] += d;
 152}
 153
 154static inline void md4_transform_helper(struct md4_ctx *ctx)
 155{
 156        le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t));
 157        md4_transform(ctx->hash, ctx->block);
 158}
 159
 160static void md4_init(struct md4_ctx *mctx)
 161{
 162        mctx->hash[0] = 0x67452301;
 163        mctx->hash[1] = 0xefcdab89;
 164        mctx->hash[2] = 0x98badcfe;
 165        mctx->hash[3] = 0x10325476;
 166        mctx->byte_count = 0;
 167}
 168
 169static void md4_update(struct md4_ctx *mctx,
 170                       const unsigned char *data, unsigned int len)
 171{
 172        const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 173
 174        mctx->byte_count += len;
 175
 176        if (avail > len) {
 177                memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 178                       data, len);
 179                return;
 180        }
 181
 182        memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 183               data, avail);
 184
 185        md4_transform_helper(mctx);
 186        data += avail;
 187        len -= avail;
 188
 189        while (len >= sizeof(mctx->block)) {
 190                memcpy(mctx->block, data, sizeof(mctx->block));
 191                md4_transform_helper(mctx);
 192                data += sizeof(mctx->block);
 193                len -= sizeof(mctx->block);
 194        }
 195
 196        memcpy(mctx->block, data, len);
 197}
 198
 199static void md4_final_ascii(struct md4_ctx *mctx, char *out, unsigned int len)
 200{
 201        const unsigned int offset = mctx->byte_count & 0x3f;
 202        char *p = (char *)mctx->block + offset;
 203        int padding = 56 - (offset + 1);
 204
 205        *p++ = 0x80;
 206        if (padding < 0) {
 207                memset(p, 0x00, padding + sizeof (uint64_t));
 208                md4_transform_helper(mctx);
 209                p = (char *)mctx->block;
 210                padding = 56;
 211        }
 212
 213        memset(p, 0, padding);
 214        mctx->block[14] = mctx->byte_count << 3;
 215        mctx->block[15] = mctx->byte_count >> 29;
 216        le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
 217                          sizeof(uint64_t)) / sizeof(uint32_t));
 218        md4_transform(mctx->hash, mctx->block);
 219        cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t));
 220
 221        snprintf(out, len, "%08X%08X%08X%08X",
 222                 mctx->hash[0], mctx->hash[1], mctx->hash[2], mctx->hash[3]);
 223}
 224
 225static inline void add_char(unsigned char c, struct md4_ctx *md)
 226{
 227        md4_update(md, &c, 1);
 228}
 229
 230static int parse_string(const char *file, unsigned long len,
 231                        struct md4_ctx *md)
 232{
 233        unsigned long i;
 234
 235        add_char(file[0], md);
 236        for (i = 1; i < len; i++) {
 237                add_char(file[i], md);
 238                if (file[i] == '"' && file[i-1] != '\\')
 239                        break;
 240        }
 241        return i;
 242}
 243
 244static int parse_comment(const char *file, unsigned long len)
 245{
 246        unsigned long i;
 247
 248        for (i = 2; i < len; i++) {
 249                if (file[i-1] == '*' && file[i] == '/')
 250                        break;
 251        }
 252        return i;
 253}
 254
 255/* FIXME: Handle .s files differently (eg. # starts comments) --RR */
 256static int parse_file(const char *fname, struct md4_ctx *md)
 257{
 258        char *file;
 259        unsigned long i, len;
 260
 261        file = grab_file(fname, &len);
 262        if (!file)
 263                return 0;
 264
 265        for (i = 0; i < len; i++) {
 266                /* Collapse and ignore \ and CR. */
 267                if (file[i] == '\\' && (i+1 < len) && file[i+1] == '\n') {
 268                        i++;
 269                        continue;
 270                }
 271
 272                /* Ignore whitespace */
 273                if (isspace(file[i]))
 274                        continue;
 275
 276                /* Handle strings as whole units */
 277                if (file[i] == '"') {
 278                        i += parse_string(file+i, len - i, md);
 279                        continue;
 280                }
 281
 282                /* Comments: ignore */
 283                if (file[i] == '/' && file[i+1] == '*') {
 284                        i += parse_comment(file+i, len - i);
 285                        continue;
 286                }
 287
 288                add_char(file[i], md);
 289        }
 290        release_file(file, len);
 291        return 1;
 292}
 293
 294/* We have dir/file.o.  Open dir/.file.o.cmd, look for deps_ line to
 295 * figure out source file. */
 296static int parse_source_files(const char *objfile, struct md4_ctx *md)
 297{
 298        char *cmd, *file, *line, *dir;
 299        const char *base;
 300        unsigned long flen, pos = 0;
 301        int dirlen, ret = 0, check_files = 0;
 302
 303        cmd = NOFAIL(malloc(strlen(objfile) + sizeof("..cmd")));
 304
 305        base = strrchr(objfile, '/');
 306        if (base) {
 307                base++;
 308                dirlen = base - objfile;
 309                sprintf(cmd, "%.*s.%s.cmd", dirlen, objfile, base);
 310        } else {
 311                dirlen = 0;
 312                sprintf(cmd, ".%s.cmd", objfile);
 313        }
 314        dir = NOFAIL(malloc(dirlen + 1));
 315        strncpy(dir, objfile, dirlen);
 316        dir[dirlen] = '\0';
 317
 318        file = grab_file(cmd, &flen);
 319        if (!file) {
 320                warn("could not find %s for %s\n", cmd, objfile);
 321                goto out;
 322        }
 323
 324        /* There will be a line like so:
 325                deps_drivers/net/dummy.o := \
 326                  drivers/net/dummy.c \
 327                    $(wildcard include/config/net/fastroute.h) \
 328                  include/linux/config.h \
 329                    $(wildcard include/config/h.h) \
 330                  include/linux/module.h \
 331
 332           Sum all files in the same dir or subdirs.
 333        */
 334        while ((line = get_next_line(&pos, file, flen)) != NULL) {
 335                char* p = line;
 336                if (strncmp(line, "deps_", sizeof("deps_")-1) == 0) {
 337                        check_files = 1;
 338                        continue;
 339                }
 340                if (!check_files)
 341                        continue;
 342
 343                /* Continue until line does not end with '\' */
 344                if ( *(p + strlen(p)-1) != '\\')
 345                        break;
 346                /* Terminate line at first space, to get rid of final ' \' */
 347                while (*p) {
 348                       if (isspace(*p)) {
 349                                *p = '\0';
 350                                break;
 351                        }
 352                        p++;
 353                }
 354
 355                /* Check if this file is in same dir as objfile */
 356                if ((strstr(line, dir)+strlen(dir)-1) == strrchr(line, '/')) {
 357                        if (!parse_file(line, md)) {
 358                                warn("could not open %s: %s\n",
 359                                     line, strerror(errno));
 360                                goto out_file;
 361                        }
 362
 363                }
 364
 365        }
 366
 367        /* Everyone parsed OK */
 368        ret = 1;
 369out_file:
 370        release_file(file, flen);
 371out:
 372        free(dir);
 373        free(cmd);
 374        return ret;
 375}
 376
 377/* Calc and record src checksum. */
 378void get_src_version(const char *modname, char sum[], unsigned sumlen)
 379{
 380        void *file;
 381        unsigned long len;
 382        struct md4_ctx md;
 383        char *sources, *end, *fname;
 384        const char *basename;
 385        char filelist[PATH_MAX + 1];
 386        char *modverdir = getenv("MODVERDIR");
 387
 388        if (!modverdir)
 389                modverdir = ".";
 390
 391        /* Source files for module are in .tmp_versions/modname.mod,
 392           after the first line. */
 393        if (strrchr(modname, '/'))
 394                basename = strrchr(modname, '/') + 1;
 395        else
 396                basename = modname;
 397        sprintf(filelist, "%s/%.*s.mod", modverdir,
 398                (int) strlen(basename) - 2, basename);
 399
 400        file = grab_file(filelist, &len);
 401        if (!file)
 402                /* not a module or .mod file missing - ignore */
 403                return;
 404
 405        sources = strchr(file, '\n');
 406        if (!sources) {
 407                warn("malformed versions file for %s\n", modname);
 408                goto release;
 409        }
 410
 411        sources++;
 412        end = strchr(sources, '\n');
 413        if (!end) {
 414                warn("bad ending versions file for %s\n", modname);
 415                goto release;
 416        }
 417        *end = '\0';
 418
 419        md4_init(&md);
 420        while ((fname = strsep(&sources, " ")) != NULL) {
 421                if (!*fname)
 422                        continue;
 423                if (!parse_source_files(fname, &md))
 424                        goto release;
 425        }
 426
 427        md4_final_ascii(&md, sum, sumlen);
 428release:
 429        release_file(file, len);
 430}
 431
 432static void write_version(const char *filename, const char *sum,
 433                          unsigned long offset)
 434{
 435        int fd;
 436
 437        fd = open(filename, O_RDWR);
 438        if (fd < 0) {
 439                warn("changing sum in %s failed: %s\n",
 440                        filename, strerror(errno));
 441                return;
 442        }
 443
 444        if (lseek(fd, offset, SEEK_SET) == (off_t)-1) {
 445                warn("changing sum in %s:%lu failed: %s\n",
 446                        filename, offset, strerror(errno));
 447                goto out;
 448        }
 449
 450        if (write(fd, sum, strlen(sum)+1) != strlen(sum)+1) {
 451                warn("writing sum in %s failed: %s\n",
 452                        filename, strerror(errno));
 453                goto out;
 454        }
 455out:
 456        close(fd);
 457}
 458
 459static int strip_rcs_crap(char *version)
 460{
 461        unsigned int len, full_len;
 462
 463        if (strncmp(version, "$Revision", strlen("$Revision")) != 0)
 464                return 0;
 465
 466        /* Space for version string follows. */
 467        full_len = strlen(version) + strlen(version + strlen(version) + 1) + 2;
 468
 469        /* Move string to start with version number: prefix will be
 470         * $Revision$ or $Revision: */
 471        len = strlen("$Revision");
 472        if (version[len] == ':' || version[len] == '$')
 473                len++;
 474        while (isspace(version[len]))
 475                len++;
 476        memmove(version, version+len, full_len-len);
 477        full_len -= len;
 478
 479        /* Preserve up to next whitespace. */
 480        len = 0;
 481        while (version[len] && !isspace(version[len]))
 482                len++;
 483        memmove(version + len, version + strlen(version),
 484                full_len - strlen(version));
 485        return 1;
 486}
 487
 488/* Clean up RCS-style version numbers. */
 489void maybe_frob_rcs_version(const char *modfilename,
 490                            char *version,
 491                            void *modinfo,
 492                            unsigned long version_offset)
 493{
 494        if (strip_rcs_crap(version))
 495                write_version(modfilename, version, version_offset);
 496}
 497